Thank you for this tip! But I am not sure if it works, because I have deleted all but the jobs. The name of the printer maybe still the same but some of the media type names changed.
I will see - thanks!

Yes, this seems to be the best.
Now it behaves, as expected. At least I do not need to check everything like the right profile and can use the excellent sharpening of QImage.
Meanwhile I have configured again all my media types again.
My only concern is that I'm not entirely sure if I'm using the same driver settings now as I was when I created the profile. Do you have any experience of how much influence the choice of quality has in this respect?
Many, many thanks for your support!
Ernst

I checked now how the driver setting is (view from windows) - Finest Details was set.
Next I started QImage. Media Type was still the same as shown in the driver setting a few moments ago. I opened Properties with Shift and it shows Finest Details enabled. I closed the Properties with OK. Print Resolution has shown for a very short moment Max-720 PPI but changed immedeately back to 360. Now I opened Properties again without holding Shift and "Finest Details" is NOT set.

I will try the following:
Delete the Printer Setup of QImage for this paper. Do all necessary settings in the driver starting from Windows. Then I start QImage and do the settings there. Properties I will oben with holded Shift, check and save.
Maybe that I already have done this without knowing, but I think, it is worth to try.
I'll tell you ...

I tried it two times now - as normal user and as administrator. But always the same. "Finest Details" setting will be lost from the view of QImage whereas it is set from the view of Windows. :-(

Another idea: First I will delete all references to this printer in QImage that I can find. Next I will delete the printer driver and reinstall it. Then I'll try to configure the Printer Setups for all papers that I need. Or do you have a better idea?
...
A few hours later - I've done the following without success:
1) I deleted all *.prt and *.pr1 files in the directory (and sub directories) C:\Users\ernst\AppData\Roaming\ddisoftware\Qimage
2) Closed QImage
3) Deleted the printer in Windows
4) Installed the most recent driver (V6.82.0.0) from Epson homepage
5) Checked in Device Manager and EPSON Print Layout, if the printer will be listed - OK; closed Print Layout
6) Started EPSON Media Installer to check, if all Media Types still are listed - OK; To be sure, I pressed again the "actualize" button; closed Media Installer
7) Opened Printer Properties, chose a media type of my matte paper, configured all quality settings, set "no color correction" and saved this setting - so I can recall these settings, if necessary
8 ) Started QImage - The Media Type is already shown, Max-Resolution is 360ppi
9) Holding Shift I started Properties and checked the settings - they were exactly as I configured before
10) Closed all with OK ... still Max-Resolution is shown as 360ppi
11) Now I opened Properties WITHOUT holding Shift -> Finest Details is NOT set

I am at the end of my wisdom

I can set it and it still is set next time when I do it by opening the driver settings from Windows. But if I open the settings from QImage kicking on Properties, it does not.
That's what I tried to explain you: I opened the driver settings side by side (same time, same view, same media type) - in the window opened with QImage Finest Details is NOT set, in the other window (opened by Window) it is set.
I could make a video from my desktop so you can see, what I mean.
And I have another strange behaviour that seems to me hat is not correct: I have chosen a Media Type, then I wanted to check Orientation or Profile (I don't remember exactly and that's why I didn't tell you before). In the moment when I pressed this other button, Media Type changed to a completely different paper. I think, Media Type never should change by itself.
I saw this behaviour two times but I never knew exactly which other button I have pressed (I am IT engineer and know how hard it is to find errors if you get wrong informations).
I printed flawless with QImage more than a year. All this began, when I tried to check the Finest Details feature.
I can reinstall QImage  - no problem, but I think it only makes sense if I can clean absolutely everything of the existing installation of QImage. What do you think?
Thanks!

"choose the profile you want, go into the driver, check the Finest Details setting, and when you are done, go back into the driver and confirm Finest Detail is still checked (it will be)."

That's the problem - it is not! I checked Finest Details, confirmed with OK, went back again into the driver and Finest Detail is not set anymore :-(

Thank you again Mike!
You are right - in Epson Media Installer there is a button "Aktualisieren" (german). After pressing this button, QImage can find the new media types.
I have deleted every entry in QImage and Media Intaller and began from scratch.
There are two Foto papers (both based on "Premium Luster Photo Paper") - now both fine with 720ppi
Five Fine Art Papers (all based on "Velvet Fine Art Paper" - only difference is thickness) - four of them were fine immedeately, with the same paper as before (the heavier of the RAG papers)  I had to fight but somehow I could resolve it; seems to be all fine now
The last paper is a matte paper (based on "Archival matte paper") and shows a strange behaviour even after several tries to delete and reconfigure again:
I choose the Media Type (I've tried different names - it's now "CNS Baryta P2 matt"), let the Source (front - fine art (thick)) and Orientation (Portrait) as is, choose the Printer Profile and press Shift + Properties. There I choose Quality Options and set best quality (5) and check the Finest Detail box. After confirmin with OK, QImage shows for a short moment the Print Resolution of Max.720 PPI, but it changes back to 360. After opening again the properties, Finest Details is disabled again.

I can live with this issue but it seems very strange to me!

Thank you very much for your competent and quick help. You not only helped me to understand the dependencies and connections better, but also motivated me to keep trying. I hope everything still works after I have removed all the superfluous media types and printer setups. But if not, at least I no longer have to worry about reconfiguring everything.
Best regards,
Ernst

...
I did another try with the matt paper. When I call up the printer properties via Windows and select the paper type for the matt paper, "Finest details" is activated. I open it at the same time side by side - one by Windows and one by QImage and it shows the same settings except "Finest Details"!???

Many thanks Mike for your quick and helpful answer - the "Finest Detail" was not checked.
BUT ... now I have another (serious) problem.
I remembered, that all my Baryta papers are printing only with 360ppi. Therefore I looked for the same setting and found, that the "Finest Detail" is missing too.
After activating this feature and quitting with OK, the Media Type entry in QImage changed to "Epson Premium Glossy". I always used the Media Type "CNS Baryta P II 310g" which I have created and worked with until now. It is not possible anymore to choose this Media Type. It does exist, but choosing this, it immediately changes to "Epson Premium Glossy" and the setting "Finest Print" is not checked again. The printer profile remains the correct one.
What is even stranger, however, is that the same thing happens with the matt baryta paper now which I have not even touched.
I hadn't even opened its settings and it is also a completely different media type. Nevertheless, the display immediately changes to Epson Premium glossy when I select the matt baryta paper. However, the printer profile remains the correct one too. This is the first time I have tried to change the driver settings since creating the printer profile.
At the moment it seems that I can no longer use these paper types with QImage.
What I also don't understand: When are the settings that were transferred to the printer using the EPSON Media Installer read by the driver/QImage? QImage only notices changes to the printer after I start EPSON Print Layout and select different printers there.
I'm sorry, but I just went from a small, harmless problem to a serious one.
What can I do? I am not sure, if I remember all driver settings that I had for creating the profiles. Maybe I have to configure all from scratch on? (For God's sake - please don't!) And when will it happen again?
I have a full backup from a view weeks ago - do I need only the printer setup files in the directory C:\Users\MYUSER\AppData\Roaming\ddisoftware\Qimage\Save ?
Many thanks!
Ernst
....
I have just noticed that other paper types are affected too. "Canson Arches 88 - 310g" is OK but "Canson Arches BFK Rives PureWhite" not. Both are fine art papers with exactly the same settings except for the paper thickness. I have deleted now a lot of papers with EPSON Media Installer that I do not use anymore. Of the remaining 8 paper types, 3 no longer work since the driver settings were changed
....
Since others are now showing the same behavior, I have now deleted all printer setups in QImage and am trying to recreate them. I will report back later whether or not I was successful.

I had already been printing with my EPSON SC-P900  on Canson RAG Photographique 210g for some time. With the EPSON Media Installer I registered this paper as "Fine Art paper" and QImage always automatically used the maximum resolution of 720ppi.
Now I have the same paper, but slightly heavier - Canson RAG Photographique 310g. Using the EPSON Media Installer, I copied the media type entry, adjusted the paper thickness and gave it a new name "CNS Rag Photographique 310g".
After I started EPSON Print Layout and changed the printer there once, the new media type was also recognized by QImage Ultimate (by the way, is there a method to update the list of media types in QImage?).
But instead of the maximum 720ppi, QImage only uses 360ppi. Attempts to change this setting directly in the driver (click on "Properties") are unsuccessful.
I already printed on Canson Arches 88 310g and Canson Arches BFK Rives Pure White 310g with 720ppi without any troubles. These are also heavier Fine Art Papers. I have done the same steps with EPSON Media Installer as now with this paper. I have no idea what happens.
Many thanks in advance,
Ernst

Thanks Terry and Mike for the quick and helpful reply!
Both methods are working fine. It's much easier and faster than my method. It's also important to do this from within QImage and not to drag&drop the new image from an external program.
Many thanks!!
Have a nice day,
Ernst

I hope I am not asking a question which would be answered in one of the many videos. Unfortunately, I have not found an answer.
My problem: I have created a page to print a photo. The page contains a frame as well as a title below the photo. Now I would rather replace the color photo with a black and white version.
My way to realize this is guaranteed to be way too cumbersome. I saved the job and edited the saved files manually with an editor. After changing the file name in the two files with the suffix .job and .jss I succeeded in what I wanted to achieve.
I suspect it can be done more simply. Can someone please help me.
Thanks in advance!
Ernst

Oops! I've misunderstood  .. I thought, that you mean "Show us some captures" (English is not my native language)
But as you are happy with this one, there I have another one that doesn't need a caption. 

Happy Easter!